void setup() {
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
}

void loop() {
  digitalWrite(5, HIGH);   
  delay(1000);                       
  digitalWrite(5, LOW);    
  delay(1000);    
  digitalWrite(6, HIGH);   
  delay(1000);                       
  digitalWrite(6, LOW);    
  delay(1000);                     
}
